space-android/src/main/java/com/owncloud/android/ui/helpers/FileOperationsHelper.java

/*
 * ownCloud Android client application
 *
 * @author masensio
 * @author David A. Velasco
 * @author Juan Carlos González Cabrero
 * Copyright (C) 2015 ownCloud Inc.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2,
 * as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.owncloud.android.ui.helpers;

import android.accounts.Account;
import android.content.ActivityNotFoundException;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.os.Build;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.content.FileProvider;
import android.view.View;
import android.webkit.MimeTypeMap;

import com.owncloud.android.MainApp;
import com.owncloud.android.R;
import com.owncloud.android.authentication.AccountUtils;
import com.owncloud.android.datamodel.FileDataStorageManager;
import com.owncloud.android.datamodel.OCFile;
import com.owncloud.android.files.services.FileDownloader.FileDownloaderBinder;
import com.owncloud.android.files.services.FileUploader.FileUploaderBinder;
import com.owncloud.android.lib.common.operations.RemoteOperationResult;
import com.owncloud.android.lib.common.utils.Log_OC;
import com.owncloud.android.lib.resources.shares.OCShare;
import com.owncloud.android.lib.resources.shares.ShareType;
import com.owncloud.android.lib.resources.status.OwnCloudVersion;
import com.owncloud.android.operations.SynchronizeFileOperation;
import com.owncloud.android.services.OperationsService;
import com.owncloud.android.services.observer.FileObserverService;
import com.owncloud.android.ui.activity.ConflictsResolveActivity;
import com.owncloud.android.ui.activity.FileActivity;
import com.owncloud.android.ui.activity.FileDisplayActivity;
import com.owncloud.android.ui.activity.ShareActivity;
import com.owncloud.android.ui.dialog.SendShareDialog;
import com.owncloud.android.ui.events.FavoriteEvent;
import com.owncloud.android.ui.events.SyncEventFinished;
import com.owncloud.android.utils.DisplayUtils;
import com.owncloud.android.utils.FileStorageUtils;
import com.owncloud.android.utils.UriUtils;

import org.greenrobot.eventbus.EventBus;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 *
 */
public class FileOperationsHelper {

    private static final String TAG = FileOperationsHelper.class.getSimpleName();
    private static final Pattern mPatternUrl = Pattern.compile("^URL=(.+)$");
    private static final Pattern mPatternString = Pattern.compile("<string>(.+)</string>");
    private FileActivity mFileActivity = null;
    /// Identifier of operation in progress which result shouldn't be lost
    private long mWaitingForOpId = Long.MAX_VALUE;

    public FileOperationsHelper(FileActivity fileActivity) {
        mFileActivity = fileActivity;
    }

    @Nullable
    private String getUrlFromFile(String storagePath, Pattern pattern) {
        String url = null;

        InputStreamReader fr = null;
        BufferedReader br = null;
        try {
            fr = new InputStreamReader(new FileInputStream(storagePath), "UTF8");
            br = new BufferedReader(fr);

            String line;
            while ((line = br.readLine()) != null) {
                Matcher m = pattern.matcher(line);
                if (m.find()) {
                    url = m.group(1);
                    break;
                }
            }
        } catch (IOException e) {
            Log_OC.d(TAG, e.getMessage());
        } finally {
            if (br != null) {
                try {
                    br.close();
                } catch (IOException e) {
                    Log_OC.d(TAG, "Error closing buffered reader for URL file", e);
                }
            }

            if (fr != null) {
                try {
                    fr.close();
                } catch (IOException e) {
                    Log_OC.d(TAG, "Error closing file reader for URL file", e);
                }
            }
        }
        return url;
    }

    @Nullable
    private Intent createIntentFromFile(String storagePath) {
        String url = null;
        int lastIndexOfDot = storagePath.lastIndexOf('.');
        if (lastIndexOfDot >= 0) {
            String fileExt = storagePath.substring(lastIndexOfDot + 1);
            if (fileExt.equalsIgnoreCase("url") || fileExt.equalsIgnoreCase("desktop")) {
                // Windows internet shortcut file .url
                // Ubuntu internet shortcut file .desktop
                url = getUrlFromFile(storagePath, mPatternUrl);
            } else if (fileExt.equalsIgnoreCase("webloc")) {
                // mac internet shortcut file .webloc
                url = getUrlFromFile(storagePath, mPatternString);
            }
        }
        if (url == null) {
            return null;
        }
        return new Intent(Intent.ACTION_VIEW, Uri.parse(url));
    }


    public void startSyncForFileAndIntent(OCFile file, Intent intent) {
        mFileActivity.showLoadingDialog(mFileActivity.getResources().getString(R.string.sync_in_progress));
        new Thread(new Runnable() {
            @Override
            public void run() {
                Account account = AccountUtils.getCurrentOwnCloudAccount(mFileActivity);
                FileDataStorageManager storageManager =
                        new FileDataStorageManager(account, mFileActivity.getContentResolver());
                SynchronizeFileOperation sfo =
                        new SynchronizeFileOperation(file, null, account, true, mFileActivity);
                RemoteOperationResult result = sfo.execute(storageManager, mFileActivity);
                if (result.getCode() == RemoteOperationResult.ResultCode.SYNC_CONFLICT) {
                    // ISSUE 5: if the user is not running the app (this is a service!),
                    // this can be very intrusive; a notification should be preferred
                    Intent i = new Intent(mFileActivity, ConflictsResolveActivity.class);
                    i.setFlags(i.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK);
                    i.putExtra(ConflictsResolveActivity.EXTRA_FILE, file);
                    i.putExtra(ConflictsResolveActivity.EXTRA_ACCOUNT, account);
                    mFileActivity.startActivity(i);
                } else {
                    if (file.isDown()) {
                        FileStorageUtils.checkIfFileFinishedSaving(file);
                        if (!result.isSuccess()) {
                            DisplayUtils.showSnackMessage(mFileActivity, R.string.file_not_synced);
                        }
                        EventBus.getDefault().post(new SyncEventFinished(intent));
                    }
                }
                mFileActivity.dismissLoadingDialog();
            }
        }).start();

    }
    public void openFile(OCFile file) {
        if (file != null) {
            String storagePath = file.getStoragePath();

            Intent openFileWithIntent = null;
            int lastIndexOfDot = storagePath.lastIndexOf('.');
            if (lastIndexOfDot >= 0) {
                String fileExt = storagePath.substring(lastIndexOfDot + 1);
                String guessedMimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(fileExt);
                if (guessedMimeType != null) {
                    openFileWithIntent = new Intent(Intent.ACTION_VIEW);
                    openFileWithIntent.setDataAndType(
                            file.getExposedFileUri(mFileActivity),
                            guessedMimeType
                    );
                }
            }

            if (openFileWithIntent == null) {
                openFileWithIntent = createIntentFromFile(storagePath);
            }

            if (openFileWithIntent == null) {
                openFileWithIntent = new Intent(Intent.ACTION_VIEW);
                openFileWithIntent.setDataAndType(
                        file.getExposedFileUri(mFileActivity),
                        file.getMimetype()
                );
            }

            openFileWithIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

            List<ResolveInfo> launchables = mFileActivity.getPackageManager().
                    queryIntentActivities(openFileWithIntent, PackageManager.GET_RESOLVED_FILTER);

            mFileActivity.showLoadingDialog(mFileActivity.getResources().getString(R.string.sync_in_progress));
            Intent finalOpenFileWithIntent = openFileWithIntent;
            new Thread(new Runnable() {
                @Override
                public void run() {
                    Account account = AccountUtils.getCurrentOwnCloudAccount(mFileActivity);
                    FileDataStorageManager storageManager =
                            new FileDataStorageManager(account, mFileActivity.getContentResolver());
                    // a fresh object is needed; many things could have occurred to the file
                    // since it was registered to observe again, assuming that local files
                    // are linked to a remote file AT MOST, SOMETHING TO BE DONE;
                    SynchronizeFileOperation sfo =
                            new SynchronizeFileOperation(file, null, account, true, mFileActivity);
                    RemoteOperationResult result = sfo.execute(storageManager, mFileActivity);
                    mFileActivity.dismissLoadingDialog();
                    if (result.getCode() == RemoteOperationResult.ResultCode.SYNC_CONFLICT) {
                        // ISSUE 5: if the user is not running the app (this is a service!),
                        // this can be very intrusive; a notification should be preferred
                        Intent i = new Intent(mFileActivity, ConflictsResolveActivity.class);
                        i.setFlags(i.getFlags() | Intent.FLAG_ACTIVITY_NEW_TASK);
                        i.putExtra(ConflictsResolveActivity.EXTRA_FILE, file);
                        i.putExtra(ConflictsResolveActivity.EXTRA_ACCOUNT, account);
                        mFileActivity.startActivity(i);
                    } else {
                        if (launchables != null && launchables.size() > 0) {
                            try {
                                if (!result.isSuccess()) {
                                    DisplayUtils.showSnackMessage(mFileActivity, R.string.file_not_synced);
                                }

                                mFileActivity.startActivity(
                                        Intent.createChooser(
                                                finalOpenFileWithIntent,
                                                mFileActivity.getString(R.string.actionbar_open_with)
                                        )
                                );
                            } catch (ActivityNotFoundException exception) {
                                DisplayUtils.showSnackMessage(mFileActivity, R.string.file_list_no_app_for_file_type);
                            }
                        } else {
                            DisplayUtils.showSnackMessage(mFileActivity, R.string.file_list_no_app_for_file_type);
                        }
                    }

                }
            }).start();

        } else {
            Log_OC.e(TAG, "Trying to open a NULL OCFile");
        }
    }

    /**
     * Helper method to share a file via a public link. Starts a request to do it in {@link OperationsService}
     *
     * @param file     The file to share.
     * @param password Optional password to protect the public share.
     */
    public void shareFileViaLink(OCFile file, String password) {
        if (isSharedSupported()) {
            if (file != null) {
                mFileActivity.showLoadingDialog(mFileActivity.getString(R.string.wait_a_moment));
                Intent service = new Intent(mFileActivity, OperationsService.class);
                service.setAction(OperationsService.ACTION_CREATE_SHARE_VIA_LINK);
                service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
                if (password != null && password.length() > 0) {
                    service.putExtra(OperationsService.EXTRA_SHARE_PASSWORD, password);
                }
                service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
                mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);

            } else {
                Log_OC.e(TAG, "Trying to share a NULL OCFile");
                // TODO user-level error?
            }

        } else {
            // Show a Message
            DisplayUtils.showSnackMessage(mFileActivity, R.string.share_link_no_support_share_api);
        }
    }

    public void getFileWithLink(OCFile file) {
        if (isSharedSupported()) {
            if (file != null) {
                mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                        getString(R.string.wait_a_moment));

                Intent service = new Intent(mFileActivity, OperationsService.class);
                service.setAction(OperationsService.ACTION_CREATE_SHARE_VIA_LINK);
                service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
                service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
                mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);

            } else {
                Log_OC.e(TAG, "Trying to share a NULL OCFile");
            }
        } else {
            // Show a Message
            DisplayUtils.showSnackMessage(mFileActivity, R.string.share_link_no_support_share_api);
        }
    }

    /**
     * Helper method to share a file with a known sharee. Starts a request to do it in {@link OperationsService}
     *
     * @param file        The file to share.
     * @param shareeName  Name (user name or group name) of the target sharee.
     * @param shareType   The share type determines the sharee type.
     * @param permissions Permissions to grant to sharee on the shared file.
     */
    public void shareFileWithSharee(OCFile file, String shareeName, ShareType shareType, int permissions) {
        if (file != null) {
            // TODO check capability?
            mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                    getString(R.string.wait_a_moment));

            Intent service = new Intent(mFileActivity, OperationsService.class);
            service.setAction(OperationsService.ACTION_CREATE_SHARE_WITH_SHAREE);
            service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            service.putExtra(OperationsService.EXTRA_SHARE_WITH, shareeName);
            service.putExtra(OperationsService.EXTRA_SHARE_TYPE, shareType);
            service.putExtra(OperationsService.EXTRA_SHARE_PERMISSIONS, permissions);
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);

        } else {
            Log_OC.e(TAG, "Trying to share a NULL OCFile");
        }
    }


    /**
     * @return 'True' if the server supports the Share API
     */
    public boolean isSharedSupported() {
        if (mFileActivity.getAccount() != null) {
            OwnCloudVersion serverVersion = AccountUtils.getServerVersion(mFileActivity.getAccount());
            return (serverVersion != null && serverVersion.isSharedSupported());
        }
        return false;
    }


    /**
     * Helper method to unshare a file publicly shared via link.
     * Starts a request to do it in {@link OperationsService}
     *
     * @param file The file to unshare.
     */
    public void unshareFileViaLink(OCFile file) {

        // Unshare the file: Create the intent
        Intent unshareService = new Intent(mFileActivity, OperationsService.class);
        unshareService.setAction(OperationsService.ACTION_UNSHARE);
        unshareService.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        unshareService.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        unshareService.putExtra(OperationsService.EXTRA_SHARE_TYPE, ShareType.PUBLIC_LINK);
        unshareService.putExtra(OperationsService.EXTRA_SHARE_WITH, "");

        queueShareIntent(unshareService);
    }

    public void unshareFileWithUserOrGroup(OCFile file, ShareType shareType, String userOrGroup) {

        // Unshare the file: Create the intent
        Intent unshareService = new Intent(mFileActivity, OperationsService.class);
        unshareService.setAction(OperationsService.ACTION_UNSHARE);
        unshareService.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        unshareService.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        unshareService.putExtra(OperationsService.EXTRA_SHARE_TYPE, shareType);
        unshareService.putExtra(OperationsService.EXTRA_SHARE_WITH, userOrGroup);

        queueShareIntent(unshareService);
    }


    private void queueShareIntent(Intent shareIntent) {
        if (isSharedSupported()) {
            // Unshare the file
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().
                    queueNewOperation(shareIntent);

            mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                    getString(R.string.wait_a_moment));

        } else {
            // Show a Message
            DisplayUtils.showSnackMessage(mFileActivity, R.string.share_link_no_support_share_api);
        }
    }

    /**
     * Show an instance of {@link ShareType} for sharing or unsharing the {@link OCFile} received as parameter.
     *
     * @param file File to share or unshare.
     */
    public void showShareFile(OCFile file) {
        Intent intent = new Intent(mFileActivity, ShareActivity.class);
        intent.putExtra(FileActivity.EXTRA_FILE, file);
        intent.putExtra(FileActivity.EXTRA_ACCOUNT, mFileActivity.getAccount());
        mFileActivity.startActivity(intent);
    }


    /**
     * Updates a public share on a file to set its password.
     * Starts a request to do it in {@link OperationsService}
     *
     * @param file     File which public share will be protected with a password.
     * @param password Password to set for the public link; null or empty string to clear
     *                 the current password
     */
    public void setPasswordToShareViaLink(OCFile file, String password) {
        // Set password updating share
        Intent updateShareIntent = new Intent(mFileActivity, OperationsService.class);
        updateShareIntent.setAction(OperationsService.ACTION_UPDATE_SHARE);
        updateShareIntent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        updateShareIntent.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        updateShareIntent.putExtra(
                OperationsService.EXTRA_SHARE_PASSWORD,
                (password == null) ? "" : password
        );

        queueShareIntent(updateShareIntent);
    }


    /**
     * Updates a public share on a file to set its expiration date.
     * Starts a request to do it in {@link OperationsService}
     *
     * @param file                   File which public share will be constrained with an expiration date.
     * @param expirationTimeInMillis Expiration date to set. A negative value clears the current expiration
     *                               date, leaving the link unrestricted. Zero makes no change.
     */
    public void setExpirationDateToShareViaLink(OCFile file, long expirationTimeInMillis) {
        Intent updateShareIntent = new Intent(mFileActivity, OperationsService.class);
        updateShareIntent.setAction(OperationsService.ACTION_UPDATE_SHARE);
        updateShareIntent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        updateShareIntent.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        updateShareIntent.putExtra(
                OperationsService.EXTRA_SHARE_EXPIRATION_DATE_IN_MILLIS,
                expirationTimeInMillis
        );
        queueShareIntent(updateShareIntent);
    }


    /**
     * Updates a share on a file to set its access permissions.
     * Starts a request to do it in {@link OperationsService}
     *
     * @param share       {@link OCShare} instance which permissions will be updated.
     * @param permissions New permissions to set. A value <= 0 makes no update.
     */
    public void setPermissionsToShare(OCShare share, int permissions) {
        Intent updateShareIntent = new Intent(mFileActivity, OperationsService.class);
        updateShareIntent.setAction(OperationsService.ACTION_UPDATE_SHARE);
        updateShareIntent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        updateShareIntent.putExtra(OperationsService.EXTRA_SHARE_ID, share.getId());
        updateShareIntent.putExtra(
                OperationsService.EXTRA_SHARE_PERMISSIONS,
                permissions
        );
        queueShareIntent(updateShareIntent);
    }

    /**
     * Updates a public share on a folder to set its editing permission.
     * Starts a request to do it in {@link OperationsService}
     *
     * @param folder           Folder which editing permission of his public share will be modified.
     * @param uploadPermission New state of the permission for editing the folder shared via link.
     */
    public void setUploadPermissionsToShare(OCFile folder, boolean uploadPermission) {
        Intent updateShareIntent = new Intent(mFileActivity, OperationsService.class);
        updateShareIntent.setAction(OperationsService.ACTION_UPDATE_SHARE);
        updateShareIntent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        updateShareIntent.putExtra(OperationsService.EXTRA_REMOTE_PATH, folder.getRemotePath());
        updateShareIntent.putExtra(
                OperationsService.EXTRA_SHARE_PUBLIC_UPLOAD,
                uploadPermission
        );
        queueShareIntent(updateShareIntent);
    }

    /**
     * Updates a public share on a folder to set its hide file listing permission.
     * Starts a request to do it in {@link OperationsService}
     *
     * @param share           {@link OCShare} instance which permissions will be updated.
     * @param hideFileListing New state of the permission for editing the folder shared via link.
     */
    public void setHideFileListingPermissionsToShare(OCShare share, boolean hideFileListing) {
        Intent updateShareIntent = new Intent(mFileActivity, OperationsService.class);
        updateShareIntent.setAction(OperationsService.ACTION_UPDATE_SHARE);
        updateShareIntent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        updateShareIntent.putExtra(OperationsService.EXTRA_SHARE_ID, share.getId());

        if (hideFileListing) {
            updateShareIntent.putExtra(OperationsService.EXTRA_SHARE_PERMISSIONS, OCShare.CREATE_PERMISSION_FLAG);
        } else {
            OwnCloudVersion serverVersion = AccountUtils.getServerVersion(mFileActivity.getAccount());

            if (serverVersion != null && serverVersion.isNotReshareableFederatedSupported()) {
                updateShareIntent.putExtra(OperationsService.EXTRA_SHARE_PERMISSIONS,
                        OCShare.FEDERATED_PERMISSIONS_FOR_FOLDER_AFTER_OC9);
            } else {
                updateShareIntent.putExtra(OperationsService.EXTRA_SHARE_PERMISSIONS,
                        OCShare.FEDERATED_PERMISSIONS_FOR_FOLDER_UP_TO_OC9);
            }
        }

        queueShareIntent(updateShareIntent);
    }

    /**
     * @return 'True' if the server supports the Search Users API
     */
    public boolean isSearchUserSupportedSupported() {
        if (mFileActivity.getAccount() != null) {
            OwnCloudVersion serverVersion = AccountUtils.getServerVersion(mFileActivity.getAccount());
            return (serverVersion != null && serverVersion.isSearchUsersSupported());
        }
        return false;
    }

    public void sendShareFile(OCFile file, FileDisplayActivity fileDisplayActivity) {
        // Show dialog
        FragmentManager fm = mFileActivity.getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        ft.addToBackStack(null);

        SendShareDialog mSendShareDialog = SendShareDialog.newInstance(file);
        mSendShareDialog.setFileOperationsHelper(this);
        mSendShareDialog.setFileDisplayActivity(fileDisplayActivity);
        mSendShareDialog.show(ft, "TAG_SEND_SHARE_DIALOG");
    }

    public void syncFiles(Collection<OCFile> files) {
        for (OCFile file : files) {
            syncFile(file);
        }
    }

    public void sendCachedImage(OCFile file) {
        if (file != null) {
            Context context = MainApp.getAppContext();
            Intent sendIntent = new Intent(Intent.ACTION_SEND);
            // set MimeType
            sendIntent.setType(file.getMimetype());
            sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("content://" +
                    context.getResources().getString(R.string.image_cache_provider_authority) +
                    file.getRemotePath()));
            sendIntent.putExtra(Intent.ACTION_SEND, true);      // Send Action

            mFileActivity.startActivity(Intent.createChooser(sendIntent, 
                    context.getString(R.string.actionbar_send_file)));
        } else {
            Log_OC.wtf(TAG, "Trying to send a NULL OCFile");
        }
    }

    public void setPictureAs(OCFile file, View view) {
        if (file != null) {
            Context context = MainApp.getAppContext();
            Intent intent = new Intent(Intent.ACTION_ATTACH_DATA);
            Uri uri;

            try {
                if (file.isDown()) {
                    File externalFile = new File(file.getStoragePath());

                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                        intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                        uri = FileProvider.getUriForFile(context,
                                context.getResources().getString(R.string.file_provider_authority), externalFile);
                    } else {
                        uri = Uri.fromFile(externalFile);
                    }
                } else {
                    uri = Uri.parse(UriUtils.URI_CONTENT_SCHEME +
                            context.getResources().getString(R.string.image_cache_provider_authority) +
                            file.getRemotePath());
                }

                intent.setDataAndType(uri, file.getMimetype());
                mFileActivity.startActivityForResult(Intent.createChooser(intent,
                        mFileActivity.getString(R.string.set_as)), 200);

                intent.setDataAndType(uri, file.getMimetype());
            } catch (ActivityNotFoundException exception) {
                Snackbar.make(view, R.string.picture_set_as_no_app, Snackbar.LENGTH_LONG).show();
            }
        } else {
            Log_OC.wtf(TAG, "Trying to send a NULL OCFile");
        }
    }

    /**
     * Request the synchronization of a file or folder with the OC server, including its contents.
     *
     * @param file The file or folder to synchronize
     */
    public void syncFile(OCFile file) {
        if (!file.isFolder()) {
            Intent intent = new Intent(mFileActivity, OperationsService.class);
            intent.setAction(OperationsService.ACTION_SYNC_FILE);
            intent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            intent.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            intent.putExtra(OperationsService.EXTRA_SYNC_FILE_CONTENTS, true);
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(intent);
            mFileActivity.showLoadingDialog(mFileActivity.getApplicationContext().
                    getString(R.string.wait_a_moment));

        } else {
            Intent intent = new Intent(mFileActivity, OperationsService.class);
            intent.setAction(OperationsService.ACTION_SYNC_FOLDER);
            intent.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            intent.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            mFileActivity.startService(intent);

        }
    }

    public void toggleFavoriteFiles(Collection<OCFile> files, boolean shouldBeFavorite) {
        List<OCFile> alreadyRightStateList = new ArrayList<>();
        for (OCFile file : files) {
            if (file.getIsFavorite() == shouldBeFavorite) {
                alreadyRightStateList.add(file);
            }
        }

        files.removeAll(alreadyRightStateList);

        for (OCFile file : files) {
            toggleFavoriteFile(file, shouldBeFavorite);
        }
    }

    private void toggleFavoriteFile(OCFile file, boolean shouldBeFavorite) {
        if (file.getIsFavorite() != shouldBeFavorite) {
            EventBus.getDefault().post(new FavoriteEvent(file.getRemotePath(), shouldBeFavorite, file.getRemoteId()));
        }
    }


    public void toggleOfflineFiles(Collection<OCFile> files, boolean isAvailableOffline) {
        List<OCFile> alreadyRightStateList = new ArrayList<>();
        for (OCFile file : files) {
            if (file.isAvailableOffline() == isAvailableOffline) {
                alreadyRightStateList.add(file);
            }
        }

        files.removeAll(alreadyRightStateList);

        for (OCFile file : files) {
            toggleOfflineFile(file, isAvailableOffline);
        }
    }


    public void toggleOfflineFile(OCFile file, boolean isAvailableOffline) {
        if (file.isAvailableOffline() != isAvailableOffline) {
            file.setAvailableOffline(isAvailableOffline);
            mFileActivity.getStorageManager().saveFile(file);

            /// register the OCFile instance in the observer service to monitor local updates
            Intent observedFileIntent = FileObserverService.makeObservedFileIntent(
                    mFileActivity,
                    file,
                    mFileActivity.getAccount(),
                    isAvailableOffline);
            mFileActivity.startService(observedFileIntent);

            /// immediate content synchronization
            if (file.isAvailableOffline()) {
                syncFile(file);
            }
        }
    }

    public void renameFile(OCFile file, String newFilename) {
        // RenameFile
        Intent service = new Intent(mFileActivity, OperationsService.class);
        service.setAction(OperationsService.ACTION_RENAME);
        service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
        service.putExtra(OperationsService.EXTRA_NEWNAME, newFilename);
        mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);

        mFileActivity.showLoadingDialog(mFileActivity.getString(R.string.wait_a_moment));
    }


    /**
     * Start operations to delete one or several files
     *
     * @param files         Files to delete
     * @param onlyLocalCopy When 'true' only local copy of the files is removed; otherwise files are also deleted
     *                      in the server.
     */
    public void removeFiles(Collection<OCFile> files, boolean onlyLocalCopy) {
        for (OCFile file : files) {
            // RemoveFile
            Intent service = new Intent(mFileActivity, OperationsService.class);
            service.setAction(OperationsService.ACTION_REMOVE);
            service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            service.putExtra(OperationsService.EXTRA_REMOVE_ONLY_LOCAL, onlyLocalCopy);
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);
        }

        mFileActivity.showLoadingDialog(mFileActivity.getString(R.string.wait_a_moment));
    }


    public void createFolder(String remotePath, boolean createFullPath) {
        // Create Folder
        Intent service = new Intent(mFileActivity, OperationsService.class);
        service.setAction(OperationsService.ACTION_CREATE_FOLDER);
        service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
        service.putExtra(OperationsService.EXTRA_REMOTE_PATH, remotePath);
        service.putExtra(OperationsService.EXTRA_CREATE_FULL_PATH, createFullPath);
        mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);

        mFileActivity.showLoadingDialog(mFileActivity.getString(R.string.wait_a_moment));
    }

    /**
     * Cancel the transference in downloads (files/folders) and file uploads
     *
     * @param file OCFile
     */
    public void cancelTransference(OCFile file) {
        Account account = mFileActivity.getAccount();
        if (file.isFolder()) {
            OperationsService.OperationsServiceBinder opsBinder =
                    mFileActivity.getOperationsServiceBinder();
            if (opsBinder != null) {
                opsBinder.cancel(account, file);
            }
        }

        // for both files and folders
        FileDownloaderBinder downloaderBinder = mFileActivity.getFileDownloaderBinder();
        if (downloaderBinder != null && downloaderBinder.isDownloading(account, file)) {
            downloaderBinder.cancel(account, file);
        }
        FileUploaderBinder uploaderBinder = mFileActivity.getFileUploaderBinder();
        if (uploaderBinder != null && uploaderBinder.isUploading(account, file)) {
            uploaderBinder.cancel(account, file);
        }
    }

    /**
     * Start operations to move one or several files
     *
     * @param files        Files to move
     * @param targetFolder Folder where the files while be moved into
     */
    public void moveFiles(Collection<OCFile> files, OCFile targetFolder) {
        for (OCFile file : files) {
            Intent service = new Intent(mFileActivity, OperationsService.class);
            service.setAction(OperationsService.ACTION_MOVE_FILE);
            service.putExtra(OperationsService.EXTRA_NEW_PARENT_PATH, targetFolder.getRemotePath());
            service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);
        }
        mFileActivity.showLoadingDialog(mFileActivity.getString(R.string.wait_a_moment));
    }

    /**
     * Start operations to copy one or several files
     *
     * @param files        Files to copy
     * @param targetFolder Folder where the files while be copied into
     */
    public void copyFiles(Collection<OCFile> files, OCFile targetFolder) {
        for (OCFile file : files) {
            Intent service = new Intent(mFileActivity, OperationsService.class);
            service.setAction(OperationsService.ACTION_COPY_FILE);
            service.putExtra(OperationsService.EXTRA_NEW_PARENT_PATH, targetFolder.getRemotePath());
            service.putExtra(OperationsService.EXTRA_REMOTE_PATH, file.getRemotePath());
            service.putExtra(OperationsService.EXTRA_ACCOUNT, mFileActivity.getAccount());
            mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);
        }
        mFileActivity.showLoadingDialog(mFileActivity.getString(R.string.wait_a_moment));
    }

    public long getOpIdWaitingFor() {
        return mWaitingForOpId;
    }


    public void setOpIdWaitingFor(long waitingForOpId) {
        mWaitingForOpId = waitingForOpId;
    }

    /**
     * @return 'True' if the server doesn't need to check forbidden characters
     */
    public boolean isVersionWithForbiddenCharacters() {
        if (mFileActivity.getAccount() != null) {
            OwnCloudVersion serverVersion =
                    AccountUtils.getServerVersion(mFileActivity.getAccount());
            return (serverVersion != null && serverVersion.isVersionWithForbiddenCharacters());
        }
        return false;
    }

    /**
     * Starts a check of the currently stored credentials for the given account.
     *
     * @param account OC account which credentials will be checked.
     */
    public void checkCurrentCredentials(Account account) {
        Intent service = new Intent(mFileActivity, OperationsService.class);
        service.setAction(OperationsService.ACTION_CHECK_CURRENT_CREDENTIALS);
        service.putExtra(OperationsService.EXTRA_ACCOUNT, account);
        mWaitingForOpId = mFileActivity.getOperationsServiceBinder().queueNewOperation(service);

        mFileActivity.showLoadingDialog(mFileActivity.getString(R.string.wait_checking_credentials));
    }
}